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4 and 25 are not prime numbers.
'25' is odd, all right, but not prime. (It can be divided by 1, 5, and 25) By the way, prime numbers must be odd numbers. All even numbers can be divided by 2, at least, and are therefore not prime.
25 percent of the numbers from 1 to 100 are prime numbers.
None of them is a prime number.
Prime factors of 10 are 2 and 5 Prime factor of 25 is 5